Pulley.



No. 821,169. PATENTED MAY 22, 1906. J. T. JOHNSON.

PULLEY.

APPLIOATION FILED JULY17, 1905.

Jawbzz/zmm 6 I by Attorneys UNITED STATES PATENT QFFIQE.

PULLEY.

Specification of Letters Patent.

Patented May 22, 1906.

Application filed July 17, 1905. Serial No. 270,084.

T 0 all who-m it may concern:

Be it known that I, JAooB T. J OHNSON, a citizen of the UnitedStates,residing at Philadelphia, in the county of Philadelphia and Stateof Pennsylvania, have invented a new and useful Pulley, of which thefollowing is a specification.

This invention relates to automatic-locking pulleys, and has for itsprincipal object to provide a pulley that is particularly adapted foruse in connection with spring-closed awnings, the pulley being soconstructed and mounted on the upper edge of the window-sill as toinsure the proper guiding of the awning operating cord or rope.

A further object of the invention is to provide an automatic-lockingpulley with a supporting-base and guard, so constructed as to permit thesecuring of the pulley in proper position.

With these and other objects in view, as will more fully hereinafterappear, the invention consists in certain novel features of constructionand arrangement of parts, hereinafter fully described, illustrated inthe accompanying drawings, and particularly pointed out in the appendedclaims, it being understood that various changes in the form,proportions, size, and minor details of the structure may be madewithout departing from the spirit or sacrificing any of the ad vantagesof the invention.

In the accompanying drawings, Figure 1 is a general perspective viewshowing an automatic-locking pulley constructed in accordance with theinvention and illustrating its employment for the purpose of guiding andlocking the operating cord or rope by a springclosed window-awning. Fig.2 is a plan View of the pulley. Fig. 3 is a front elevation of the same.Fig. 4 is a vertical section of the pulley and its supportingbase.

Similar characters of reference are employed to indicate correspondingparts throughout the several figures of the drawings.

The device forming the subject of the present invention is adaptedparticularly for use in connection with awnings of the type shown inFig. 1, wherein the awning a: is secured to a frame y, substantiallyU-shaped in form, the inner ends of the arms of the frame being coiledto form torsion-springs and being connected to the window-frame in suchmanner that if left free the frame will move to the vertical positionand close the awning. The outer portion of the frame is connected to anoperating cord or rope z, the lower portion of which extends partlyaround and is guided by the pulley 10, while the inner end of the cordleads within the room and in convenient position to be manipulated inlowering or raising the awning and for locking the same in any positionto which it may be adjusted. The strain on the cord or rope due to thepeculiar construction of the awning is such that considerably difficultyis found in the employment of cord guiding and locking devices of theordinary type, and in carrying out the present invention the selflockingpulley 10 and its supporting-base are so arranged as to permit theproper guiding of the cord and to allow locking of the same with theawning in any position of adjustment.

The pulley is provided with a base-plate 1 1, near the outer ends ofwhich are arranged openings 12 for the passage of screws or othersecuring devices, which are driven into the upper surface of thewindow-sill. At the front of the base-plate is a depending flange 12,

arranged, preferably, at a right angle to the base and provided with acentral opening 13 for the passage of a screw, so that the pulley may befirmly secured in place to the outer front edge of the sill and alldownward and upward strains effectually resisted. Extending upward fromthe base-plate is a pair of spaced standards 14, having openings for thereception of the end pintles 15 of a pulley 10, and said pulley isprovided with a centrally disposed annular groove 16, around which thecord is guided and on which the cord is free to run so long as it ismaintained at a right angle to the axis of the pulley. The periphery ofthe pulley is also provided with one or more locking-grooves 17, leadingfrom the central groove toward the edge of the pulley and formingcam-surfaces, which, in connection with the adjacent upper face of thebaseplate, form clamps for locking the cord when the inner end of thelatter is drawn to one side or the other of the groove 16. In order topermit free passage of the cord while the latter is maintained in theannular groove 16, the central portion of the base-plate is providedwith a transverselyextending groove 19, which may terminate short of theouter edge of the plate, this groove, in connection with the annulargroove 16, forming a space of much greater width than the diameter ofthe cord 3 but if the cord edge 0 is drawn to one side or the other itwill travel in one of the cam-grooves 17 and be moved directly againstthe surface of the base-plate and firmly locked in position.

To further assist in guiding the cord, the standards 14 are providedwith inwardlyprojecting guiding-wings 19, fitting over the ends of thepulley and being spaced from each other for a distance approximatelyequal to the width of the annular groove 16. These iguards or guidesextend from the front the base-plate upward over the front and slightlyover the top of the pulley, the length of the guides insuring the properpositioning of the cord within the groove 16 without regard to thevarious angular positions of the cord during the movement of the awningfrom open to closed position, or vice versa.

During the movement-of the awning from closed to open position the outerportion of the cord extends first in a practically vertical plane, andas the awning is pulled down the cord moves outward to an angle ofapproximately sixty degrees; but it will be noted that the wings orguards 19 are arranged to cover rather more than this arcuate distance,so that the cord is at all times properly guided to the annular groove16 and there will be no danger of entangling or knotting of the cord atthe outer side of the pulley. It is only when the inner end of the cordis drawn sidewise with respect to the pulley and allowed to move outwardthat said cord is gripped between one of the cam-grooves 17 of thepulley and the adjacent surface of the base-plate.

The construction of the base is such that the pulley may be securelyheld to the outer upper edge of the window-sill and the securing devicesarranged in the best position to effectively resist the strain on thecord.

Having thus described the invention, what is claimed is 1. Incombination, a base-plate having a downwardly-extending flange at itsfront edge, the plate and flange being provided with openings for thepassage of securing devices, a pair of spaced standards carried by thebase-plate, a self-locking pulley mounted between said standards, andcord guides or guards extending inward from the standards over the frontface of the pulley, said guards being spaced from each other at thecentral portion of the pulley to permit the free passage of the cord.

2. In combination, a base-flange having a pendent flange at its forwardedge, the plate and flange having openings for the passage of securingdevices, a pair of spaced standards rising from the base-plate, aself-locking pulley mounted in the standards and having acentrally-disposed peripheral groove, there being a similar grooveformed in the upper face of the base-plate at a point opposite saidannular groove, and a pair of cord-guides ex tending inward from thestandards and spaced from each other a distance approximately equal tothe width of said annular groove, said guides extending from thebaseplate upward over the front and a portion of the top of the pulley.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two W'iilIlGSSGS.

JACOB T. JOHNSON.

Witnesses:

W. J. ROBERTSON, Sn, S. D. EVANS.

